How do you open a file in C++?

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You need to use an ifstream if you just want to read (use an ofstream to write, or an fstream for both).

To open a file in text mode, do the following:

ifstream in("filename.ext", ios_base::in); // the in flag is optional

To open a file in binary mode, you just need to add the “binary” flag.

ifstream in2("filename2.ext", ios_base::in | ios_base::binary );

Use the ifstream.read() function to read a block of characters (in binary or text mode). Use the getline() function (it’s global) to read an entire line.

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